field to 32 bits, thus enabling correct handling of ByVal
structs bigger than 0x1ffff.  Abstract interface a bit.
Fixes gcc.c-torture/execute/pr23135.c and 
gcc.c-torture/execute/pr28982b.c in gcc testsuite (were ICE'ing
on ppc32, quietly producing wrong code on x86-32.)

llvm-svn: 48122

llvm-svn: 46930

llvm-svn: 46002

llvm-svn: 45995

llvm-svn: 45418

llvm-svn: 40986

llvm-svn: 37640

llvm-svn: 34738

llvm-svn: 34736

llvm-svn: 34656

llvm-svn: 34655